Doorlatch



16, 1936. A. MICHAUKA 2,044,622

DOORLATCH I Filed July 15, 1935 2 Sheets-Sheet l 70 mj www HIS ATTORNEYSA. MICHAUKA DOORLATCH June 16, 1936.

Filed July 15, 1935 2 Sheets-Sheet 2 A Map/hum.

INVENTOR Hi ATTORNEYS Patented June 16, 1936 UNITED STATES PATENT QFFICE.5 Claims.

My invention relates to door locks, and has among its objects andadvantages the provision of an improved key operated latch embodyingimprovements over my prior Patent 1,982,529, Nov. 27, 1934.

In the accompanying drawings:

Fig. 1 is a top plan view of the device;

Fig. 2 is a sectional view along the line 2-2 of Fig. 1;

Fig. 3 is a sectional view along the line 3-3 of Fig. 2;

Fig. 4 is a sectional view along the line 4- of Fig. 2;

Fig. 5 is a sectional view along the line 5-5 F of Fig. 2; A

Fig. 6 is a sectional view of a difierent latch;

Fig. 7 is a sectional view along the line ll of Fig. 6; and

Fig. 8 is a sectional view along the line 8--8 of Fig. 6.

In the embodiment selected to illustrate my invention, I make use of adoor frame I!) carrying a keeper plate [2 secured thereto by screws M.The door I6 is arranged in operative relation with the frame I0, andlies against the abutment strip IS in the closed position of the door.The door is latched in position by means of a latch bolt 20 havinglatching relation with the plate 'I 2.

In Fig. 2, the latch bolt .20 projects through an opening 22 in thecasing 24. This casing is provided with ears 26 having openings for thereception of screws 28 imbedded in the door It! for mounting the casingthereto. A plate 39 closes the open side of the casing and is secured inposition by means of screws 32 anchored in posts 34 cast as integralparts of the casing wall 36.

Referring to Fig. 4, the latch bolt 20' is pivotally mounted at 38 upona stud having an end projecting through an opening 42 in the wall 36 andswaged for rigid connection with the casing. It will be noted that thestud 40 includes a shoulder 44 against which the latch bolt 20 bearswith the end of the stud terminating substantially flush with theopposite side of the latch bolt. The latch bolt is free to pivot uponthe stud at its reduced end 38 as indicated in Fig. 2. In the full lineposition, the latch bolt lies within a slot 46 in the keeper plate l2and the hook 48 of the latch bolt extends over the keeper plate. In thisway, the door "5 is latched against swinging movement about its hingesand the hook part 48 performs a latching function in cases where thelatch is connected with sliding doors.

Upon the latch bolt 20, I slidably mount a latch element 50. Thiselement may be adjusted along the latch bolt to position its end betweenthe latch bolt and one edge of the opening 22, where-- by the latch bolt20 is restrained from pivotal movement about the stud 49. Means forshifting the latch element 50 comprises a gear 52 ar- 5 ranged in meshwith a rack 54 carried by the plate 56 riveted to the latch element 59at 58. The rivets 58 extend through a guide plate SE arranged inoverlapping relation with the latch bolt 20 for guiding the latchelement thereaiong. I connect an abutment 62 with the plate as, whichco-operates with the latch bolt 2% for holding the gear 52 in mesh withthe rack 56. An opening 64 in the plate 56 permits shifting the platewith respect to :the gear-52.

I mount the gear '52 upon ashaft 66 connected with a key operatedcylinder 68 comprising a part of the lock and-carried by the door. Theshaft '66 is rectangular in cross section, and the gear 52 is positionedbetween the end of the stud 4!! and a similar stud 12 connected with thecover plate 30 inthe same way as the con nection 42. y

In operation, the latch element 5i! may be shifted to the 'fullor dottedline position of Fig. 2 by turning the key M. In the full line position,the latch bolt is held in latched relation with the keeper plate 12. Inthe dotted line position the latch bolt 20 is lifted clear of the keeperplate 12.

Such shifting is brought about by moving the latch element inwardly asfar as the slots 64 will permit, after which further turning of the key14 rotates the gear 52. Further rotation of. the gear causes pivotalmovement of the latch bolt 20 to a non-latching position with respect tothe keeper plate.

I illustrate the latch bolt 20 as being provided with a grip 16extending through a slot 78 in the casing 24. When the key M isreleased, the latch bolt 20 will, of course, drop. When in the latchingposition, the latch bolt may be lifted from a position inside the roomby lifting the grip 16.

In Figs. 6, 7, and 8, I illustrate a different form in which the latchelement 80 is shifted along the latch bolt 82 through the medium of agear mechanism 84. In this form, the latch bolt 82 is pivotally mountedupon the neck 86 of the stud 88. To the plate 90 I connect an arm 92through the medium of a pin 94 carried by the plate, which pin projectsinto a slot 96 in the arm 92. This slot permits pivotal action of thelatch bolt 82 and the latch element 80. One end of the arm 92 isfastened to a screw 98 having threaded relation with a helical gear I00arranged in mesh with a second helical gear I02. The gear I00 has shaftparts I04 rotatably mounted within bearings I06, which bearings permitrotary movement but prevent axial shifting of the gear. Thus, rotationof the gear I00 imparts movement to the screw 98, whereby the latchelement may be shifted.

I connect the gear I02 with a shaft I08 connected with a key operatedcylinder II 0 of the same type as the cylinder 68. In turning the keyH2, the latch element 80 may be shifted to the dotted line position, atwhich time the latch element and the latch bolt 82 will move to thedotted line by gravity alone position because of the shifted center ofgravity of the assembly.

In Fig. '7, the latch bolt 82 is provided with two grips I I4 and I I6.The grip II4 projects through a slot H8 in the casing I20, while thegrip IIB projects through a slot in the cover plate I22 and an alignedslot I24 in the door I26. In returning the latch element 80 to the fullline position of Fig. 6, the grip H6 is depressed for shifting theelement 80 and the latch bolt 82 to a horizontal position, after whichthe key is turned for moving the latch element to its 'full lineposition.

Without further elaboration, the foregoing will so fully explain myinvention that others may, by applying current knowledge, readily adaptthe same for use under various conditions of. service.

I claim:

1. In a door latch, a supporting structure including an abutment, alatch bolt pivotally mounted upon said supporting, structure, a latchelement slidably associated with the latch bolt, and key operated meansfor shifting the latch element to a position between the latch bolt andsaid abutment, for holding the latch bolt in operative relation with akeeper plate, said latch element being retractable to a position free ofthe abutment for permitting the latch bolt to be shifted out of latchingrelation with the keeper plate, said latch bolt being so balanced withthe latch element in its retracted position as to swing away from thekeeper plate.

2. A door latch comprising a housing having a latch bolt pivotallymounted therein, said housing having an opening and said latch boltprojecting through the opening for engagement with a keeper plate, alatch element slidably mounted upon the latch bolt and arranged to bepositioned between the latter and one edge of the opening for holdingthe latch bolt in latching relation with the keeper plate, and keyoperated means for retracting the latch element, to permit pivotalmovement of the latch bolt, further movement of the key after retractionof. the latch element imparting pivotal movement to the latch bolt.

3. A door latch comprising a housing havinga latch bolt pivotallymounted therein, said housing having an opening and said latch boltprojecting through the opening for engagement with a keeper plate, alatch element slidably mounted upon the latch bolt and arranged to bepositioned between the latter and one edge of the opening for holdingthe latch bolt in latching relation with the keeper plate, and keyoperated means for retracting the latch element, to permit pivotalmovement of the latch bolt, further movement of the key after retractionof. the latch element imparting pivotal movement of the latch bolt, saidkey operated means comprising in part a rack carried by the latchelement, and a gear rotatable by the key.

4. A device of the type described comprising a housing, a latch boltpivotally mounted in said housing, a latch element slidably associatedtherewith, an abutment, a rack carried by said latch element, a gearconnected with said rack, and a key operated mechanism connected withsaid gear, said latch element being shiftable to a position between thelatch bolt and said abutment, to hold the latch bolt against pivotalmovement, said latch element being retractable, to permit pivotalmovement of the latch bolt, the latter being pivoted upon furthermovement of the key after retraction of the latch element.

5. A latching device comprising a housing, a latch bolt pivotallymounted therein, a latch element slidably associated with the latchbolt, an abutment comprising a part of the housing, key operated screwand gear means for moving the latch element to a position between thelatch bolt and said abutment, to hold the latch bolt against pivotalmovement, said latch element being retractable to a position away fromthe abutment, to permit pivotal movement of the latch bolt, shifting ofthe latch element to its fully retracted position causing pivotalmovement of the latch bolt.

ANTHONY MICI-IAUKA.

